$NetBSD: clock.9,v 1.1 2014/12/22 18:02:52 wiz Exp $
Copyright (c) 2014 The NetBSD Foundation, Inc.
All rights reserved.
This code is contributed to The NetBSD Foundation by Kamil Rytarowski
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd December 26, 2014 .Dt CLOCK 9 .Os .Sh NAME .Nm days_in_month , .Nm is_leap_year , .Nm days_per_year .Nd handy time utilities .Sh SYNOPSIS n sys/clock.h .Vt #define SECS_PER_MINUTE 60 .Vt #define SECS_PER_HOUR 3600 .Vt #define SECS_PER_DAY 86400 .Vt #define DAYS_PER_COMMON_YEAR 365 .Vt #define DAYS_PER_LEAP_YEAR 366 .Vt #define SECS_PER_COMMON_YEAR (SECS_PER_DAY * DAYS_PER_COMMON_YEAR) .Vt #define SECS_PER_LEAP_YEAR (SECS_PER_DAY * DAYS_PER_LEAP_YEAR) .Ft static inline int .Fn days_in_month "int m" .Ft static inline int .Fn is_leap_year "uint64_t year" .Ft static inline int .Fn days_per_year "uint64_t year" .Sh DESCRIPTION The n sys/clock.h file provides handy time constants and .Ft static inline functions. .Sh FUNCTIONS The .Fn days_in_month function returns the number of days in the given month. .Fn days_in_month assumes 28 days for February. If the input value is out of the valid range (1-12) then the function returns -1.
Copyright (c) 2014 The NetBSD Foundation, Inc.
All rights reserved.
This code is contributed to The NetBSD Foundation by Kamil Rytarowski
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd December 26, 2014 .Dt CLOCK 9 .Os .Sh NAME .Nm days_in_month , .Nm is_leap_year , .Nm days_per_year .Nd handy time utilities .Sh SYNOPSIS n sys/clock.h .Vt #define SECS_PER_MINUTE 60 .Vt #define SECS_PER_HOUR 3600 .Vt #define SECS_PER_DAY 86400 .Vt #define DAYS_PER_COMMON_YEAR 365 .Vt #define DAYS_PER_LEAP_YEAR 366 .Vt #define SECS_PER_COMMON_YEAR (SECS_PER_DAY * DAYS_PER_COMMON_YEAR) .Vt #define SECS_PER_LEAP_YEAR (SECS_PER_DAY * DAYS_PER_LEAP_YEAR) .Ft static inline int .Fn days_in_month "int m" .Ft static inline int .Fn is_leap_year "uint64_t year" .Ft static inline int .Fn days_per_year "uint64_t year" .Sh DESCRIPTION The n sys/clock.h file provides handy time constants and .Ft static inline functions. .Sh FUNCTIONS The .Fn days_in_month function returns the number of days in the given month. .Fn days_in_month assumes 28 days for February. If the input value is out of the valid range (1-12) then the function returns -1.
p The .Fn is_leap_year and .Fn days_per_year functions take as the input parameter a value in the Gregorian year format. .Sh SEE ALSO .Xr bintime 9 , .Xr boottime 9 , .Xr time_second 9 , .Xr time_uptime 9 , .Xr todr_gettime 9 .Sh HISTORY The n sys/clock.h header with handy utilities originated from n dev/clock_subr.h , which originated from n arch/hp300/hp300/clock.c .
p The n arch/hp300/hp300/clock.c file first appeared in .Nx 0.8 as a set of hp300 time-converting functions. n dev/clock_subr.h first appeared in .Nx 1.3 as a shared list of functions to convert between .Dq year/month/day/hour/minute/second and seconds since 1970
q Dq POSIX time . The n sys/clock.h file first appeared in .Nx 8 . .Sh AUTHORS .An Kamil Rytarowski